No noticeable difference with top up or down.
Things i noticed
Center speaker is overpowering in surround or stereo mode
Rear speakers are super mute.
EQ helps but barley and would almost need to be adjusted on ever song to be good. Or at minimum every "album"
Something is very off about...
I run 93 Shell first if i can help it, then 93 on the other top tiers in no particular order.
Even thought it says 87+, the premium is a better gas for your engine, as stated
I remember back a piece ago lookingfor the good ole Sunoco Ultra 94